<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: WordParser.html 409 2014-08-18 16:46:48Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.Collection;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.TreeSet;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.regex.Matcher;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>/**<a name="line.14"></a>
<span class="sourceLineNo">015</span> * Parses a word (one or more non-whitespace characters).<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span>public class WordParser implements Parser&lt;String&gt; {<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>    private final Collection&lt;String&gt; words;<a name="line.19"></a>
<span class="sourceLineNo">020</span>    private final String description;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>    /**<a name="line.22"></a>
<span class="sourceLineNo">023</span>     * Constructor for when there's a fixed set of possibilities.<a name="line.23"></a>
<span class="sourceLineNo">024</span>     *<a name="line.24"></a>
<span class="sourceLineNo">025</span>     * @param words words to look for<a name="line.25"></a>
<span class="sourceLineNo">026</span>     * @param description what to call words (e.g., "command")<a name="line.26"></a>
<span class="sourceLineNo">027</span>     * @throws IllegalArgumentException if {@code words} is null<a name="line.27"></a>
<span class="sourceLineNo">028</span>     * @throws IllegalArgumentException if {@code description} is null<a name="line.28"></a>
<span class="sourceLineNo">029</span>     */<a name="line.29"></a>
<span class="sourceLineNo">030</span>    public WordParser(Collection&lt;String&gt; words, String description) {<a name="line.30"></a>
<span class="sourceLineNo">031</span>        if (words == null)<a name="line.31"></a>
<span class="sourceLineNo">032</span>            throw new IllegalArgumentException("null words");<a name="line.32"></a>
<span class="sourceLineNo">033</span>        if (description == null)<a name="line.33"></a>
<span class="sourceLineNo">034</span>            throw new IllegalArgumentException("null description");<a name="line.34"></a>
<span class="sourceLineNo">035</span>        this.words = new TreeSet&lt;&gt;(words);<a name="line.35"></a>
<span class="sourceLineNo">036</span>        this.description = description;<a name="line.36"></a>
<span class="sourceLineNo">037</span>    }<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>    /**<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * Constructor when any word is acceptable.<a name="line.40"></a>
<span class="sourceLineNo">041</span>     *<a name="line.41"></a>
<span class="sourceLineNo">042</span>     * @throws IllegalArgumentException if {@code words} is null<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * @param description what to call words (e.g., "command")<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * @throws IllegalArgumentException if {@code description} is null<a name="line.44"></a>
<span class="sourceLineNo">045</span>     */<a name="line.45"></a>
<span class="sourceLineNo">046</span>    public WordParser(String description) {<a name="line.46"></a>
<span class="sourceLineNo">047</span>        if (description == null)<a name="line.47"></a>
<span class="sourceLineNo">048</span>            throw new IllegalArgumentException("null description");<a name="line.48"></a>
<span class="sourceLineNo">049</span>        this.words = null;<a name="line.49"></a>
<span class="sourceLineNo">050</span>        this.description = description;<a name="line.50"></a>
<span class="sourceLineNo">051</span>    }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>    /**<a name="line.53"></a>
<span class="sourceLineNo">054</span>     * Get the set of valid words, if there is such a set.<a name="line.54"></a>
<span class="sourceLineNo">055</span>     *<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * &lt;p&gt;<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * The implementation in {@link WordParser} returns the collection provided to the constructor, if any.<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * &lt;/p&gt;<a name="line.58"></a>
<span class="sourceLineNo">059</span>     *<a name="line.59"></a>
<span class="sourceLineNo">060</span>     * @return collection of valid words, or null to not place any restriction<a name="line.60"></a>
<span class="sourceLineNo">061</span>     */<a name="line.61"></a>
<span class="sourceLineNo">062</span>    protected Collection&lt;String&gt; getWords() {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        return this.words;<a name="line.63"></a>
<span class="sourceLineNo">064</span>    }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>    @Override<a name="line.66"></a>
<span class="sourceLineNo">067</span>    public String parse(ParseSession session, ParseContext ctx, boolean complete) {<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>        // Get word<a name="line.69"></a>
<span class="sourceLineNo">070</span>        final Matcher matcher = ctx.tryPattern("[^\\s;]*");<a name="line.70"></a>
<span class="sourceLineNo">071</span>        if (matcher == null)<a name="line.71"></a>
<span class="sourceLineNo">072</span>            throw new ParseException(ctx);<a name="line.72"></a>
<span class="sourceLineNo">073</span>        final String word = matcher.group();<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span>        // Check word<a name="line.75"></a>
<span class="sourceLineNo">076</span>        final Collection&lt;String&gt; validWords = this.getWords();<a name="line.76"></a>
<span class="sourceLineNo">077</span>        if (validWords != null) {<a name="line.77"></a>
<span class="sourceLineNo">078</span>            final TreeSet&lt;String&gt; sortedWords = new TreeSet&lt;&gt;(validWords);<a name="line.78"></a>
<span class="sourceLineNo">079</span>            if (!sortedWords.contains(word)) {<a name="line.79"></a>
<span class="sourceLineNo">080</span>                throw new ParseException(ctx, "unknown " + this.description + " `" + word + "'")<a name="line.80"></a>
<span class="sourceLineNo">081</span>                  .addCompletions(ParseUtil.complete(sortedWords, word));<a name="line.81"></a>
<span class="sourceLineNo">082</span>            }<a name="line.82"></a>
<span class="sourceLineNo">083</span>        } else if (word.length() == 0)<a name="line.83"></a>
<span class="sourceLineNo">084</span>            throw new ParseException(ctx, "missing " + this.description);<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
<span class="sourceLineNo">086</span>        // Done<a name="line.86"></a>
<span class="sourceLineNo">087</span>        return word;<a name="line.87"></a>
<span class="sourceLineNo">088</span>    }<a name="line.88"></a>
<span class="sourceLineNo">089</span>}<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>




























































</pre>
</div>
</body>
</html>
